高等学校化学学报

高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (2): 238.

• 论文 • 上一篇    下一篇

硝酸铀酰-硝酸-磷酸三丁酯体系的反萃取动力学研究

周祖铭, 余绍宁, 詹永祖   

  1. 复旦大学物理二系, 上海, 200433
  • 收稿日期:1991-02-06 出版日期:1992-02-24 发布日期:1992-02-24
  • 通讯作者: 周祖铭

Kinetic Studies on the Stripping of Uranyl Nitrate in TBP-HNO3 System

ZHOU Zu-ming, YU Shao-ning, ZHAN Yong-zu   

  1. Department of Physics Ⅱ, Fudan University, Shanghai, 200433
  • Received:1991-02-06 Online:1992-02-24 Published:1992-02-24

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被引次数

3

摘要： 本文采用恒界面池法和上升单液滴法研究了UO2(NO3)2/HNO3/TBP-环己烷体系的反萃取动力学。得出扩散控制下的反萃速率方程为R=k1[U](O)[TBP](O)-1.17[HNO3]-1.70;在恒定硝酸浓度下化学反应控制的反萃速率方程为R=k2[U](O)[TBP]0(O),并对二种速控类型下的反萃机制进行了讨论。

关键词: 铀(Ⅵ), 硝酸, 磷酸三丁酯, 反萃取动力学

Abstract: The kinetics of the stripping of UO2(NO3)2 in tri-n-butyl phosphate(TBP)-cyclohex-ane with nitric acid solution has been investigated by using constant-interface cell and single drop techniqueUnder the conditions of the constant-interface cell method, the rate of stripping of uranium (VI) increased steadily with the stirring speed and was nearly independent of temperatureThe rate equation was R = k1[U](o)[TBP](o)-1.17[HNO3]-1.70 The rate of stripping might be controlled by the diffusion process of complex UO2(NO3)2·2TBP from the organic, phase to the interfaceIn the case of single drop method, the rate of stripping of uranium (VI) increased with increasing temperature and the apparent activation energy was found to be 278 kJ/molThe rate equation was R = k2[U](o)[TBP]0(o) in 3 mol/L HNO3. It is suggested that the rate-controlling step might be the dissociation reaction of the complex UO2(NO3)2·2TBP at the interface.

Key words: Uranium, Nitric acid, Tri-w-butyl phosphate, Kinetics of stripping

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